Google+ Authorship of a UG GDO page

I would like to know how one can gain Google+ ownership of a user group page on GDO.

As one of the organizers of Inland Empire Drupal, https://groups.drupal.org/inland-empire, I am unsure how this has occurred without consent. A Google search for "Inland Empire Drupal" shows ownership for an individual who is not even listed as Group organizer. As it is my understanding, there are two options for claiming ownership of a page. One is having an email address on the domain in question and other is placing a related "rel=author" tag in the content. A scan of source code reveals no "rel=" tag so I am clueless. Unless I am wrong, I don't believe this occurs accidentally through a Google crawler.

https://plus.google.com/authorship seems to indicate that it's possible for Google to read authorship information out of pages that lack a 'rel="author"' element. Looking at the Inland Empire group homepage, it looks like https://groups.drupal.org/node/310863 is presented on the homepage and includes the text, "by Christefano Reyes" which is consistent with the criteria that Google lists as necessary for detecting authorship information.

Thanks for the follow-up. That suffices for an answer and didn't realize Christefano was on vacation. I'll update that particular listing and let Google index takes its course. It is go to know about the "by ..." line. Unfortunately, this potentially could have inadvertently affect other groups due to cross posting and such if a "by ..." is used. This entirely minor but perhaps in future, rel=author should be stripped out of content since its the only way to link a Google+ to a domain outside of having email on that domain.